A specialized state-of-the-art milling tool grinds away at an aluminum ring with a diameter of nearly 20 feet in the Mechanical Fabrication Branch at NASA's Marshall Space Flight Center in Huntsville, Ala. This ring will match the design of adapter rings to be used on the flight test of the Orion spacecraft in 2014 on a Delta IV rocket and on the first flight of NASA's Space Launch System in 2017.